Caramelized Onion Burger (or sliders) – the perfect party food that everyone will love! (Paleo/Whole30)
- 2 tablespoons mayo
- 1 teaspoon balsamic vinegar
- 3–4 Sunions onions, sliced
- 1 Tablespoon olive oil
- 1/2 teaspoon salt
- 1/2 teaspoon ground black pepper
- 2 pounds ground beef
- 2 teaspoons kosher salt
- 2 teaspoons ground black pepper
Other Toppings: ice berg lettuce (for lettuce buns) bacon and pickles
- Combine ingredients in small bowl and mix to combine. Make additional sauce as-needed.
- Bring large cast iron skillet to medium-high heat. Add olive oil and move it around so that the entire pan is coated.
- Add onions and sprinkle with salt and pepper.
- Move onions around the pan and bring heat down to medium once onions start to cook down.
- Continue cooking onions 15-30 minutes, turning heat down as necessary, until they start to turn golden brown.
- Once onions are golden brown, turn off heat and set aside until burgers are ready.
- Turn broiler to HIGH and line a baking sheet with foil and place an oven-safe wire rack on top. Spray the rack with olive oil or other non-stick.
- Place ground beef, salt and pepper in medium bowl and mix what hands to combine well.
- Divide into 12 equal patties and place on top of wire rack. Ensure the are approximately 1/2 inch thick.
- Make a small indent in the middle of each burger and place a small bit of ghee inside.
- Sprinkle the tops of the burgers with a little more salt and pepper.
- Place in oven on the middle rack and cook for 10 minutes (this will result in a medium-rare center).
- Remove and let rest at least 5 minutes.
- For a Paleo/Whole30 option serve with a caramelized onions, lettuce bun, bacon, pickle and balsamic mayo.
- For a non-Paleo/Whole30 option serve on a slider bun of your choosing, add some cheese and then the caramelized onions, lettuce bun, bacon, pickle and balsamic mayo.
- For Whole30/Paleo – double check your ingredients on your balsamic vinegar, mayo, bacon and pickles.
- I like to make my own mayo – the recipe is here.
- You can continue cooking the onions them beyond 30 minutes and they will only continue to caramelize. I prefer to have my caramelized onions still a little firm and not completely mushy, but that is completely personal preference.
- You can easily make these into full-sized burger is you prefer. Simply make 8 burger patties instead of 12. Make sure you are flattening them enough before cooking. Cook for 10-12 minutes for medium rare.
- You can also grill your burgers/sliders if you prefer!
Keywords: caramelized onion burger